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By renewing our driver’s license at the DMV, most of us are aware of the process of registering to become an organ donor should the worst come to pass. But there is another group of organ donors — living donors — who are helping relatives, friends and even strangers by donating a kidney or part of their liver. Living donors who choose to give a kidney — the most commonly donated organ — can live a full life with the remaining kidney.

Every February, a very famous football game consumes the general American public. Football is a beloved sport and pastime that celebrates athleticism and teamwork and captures the imaginations of kids who have dreams of going pro. But as The Big Game has grown in size and spectacle over the years, more concern has bubbled up over head injuries, like concussions, in football.

There’s a lot to love about football, but there are also safety factors to consider — as there are with any sport. Here’s what to know about concussions and football.

What is the difference between cardiovascular disease and heart disease?

These two terms are often used interchangeably, but there is a difference. Cardiovascular disease is an umbrella term that encompasses several heart conditions, including heart disease, coronary heart disease, stroke, heart failure and peripheral artery disease.

At least 2.7 million Americans have atrial fibrillation, or a-fib, the most common kind of irregular heartbeat, also known as arrhythmia. A-fib is caused when the heart’s upper chambers beat erratically or quiver and don’t sync with the heart’s lower chambers. Learn more about how a-fib occurs.